A lump on the ear can be related to sebaceous cysts, boils, keloids, lipomas and other factors. 1. Sebaceous cysts: The bumps on the ears may be due to the blockage of the sebaceous gland ducts in the skin, resulting in the gradual accumulation of sebum and the formation of sebaceous cysts, which may be present for many years without any conscious symptoms, but are also susceptible to infections and pus breakouts. 2. Boils: These are caused by acute bacterial purulent inflammation of individual hair follicles and their surrounding tissues, mainly due to infection with Staphylococcus aureus, and are common on the head and face, and may also appear in the ears with localized bumps, accompanied by redness, swelling and pain. 3. Keloid: a lump on the ear is not excluded due to keloid left over from ear piercing, or post-inflammatory keloid. 4. Lipoma: it can occur in any part of the body with fat, mainly caused by genetic factors, chronic inflammation and systemic lipid metabolism abnormality, which is composed of mature fat cells. There may be other reasons for the growth of a lump on the ear, it is recommended that patients can go to the otorhinolaryngology department of the hospital, cooperate with the doctor to improve the relevant examination, to determine the cause of its treatment and treatment.